不锈钢供水管材的土壤外腐蚀特性试验  

Experiment of Soil External Corrosion Characteristics for Stainless Steel Pipeline Materials of Water Supply

作　　者：温朵 李伟英[1,2] 宋欣 迟冉 熊清华 罗晓静 WEN Duo;LI Weiying;SONG Xin;CHI Ran;XIONG Qinghua;LUO Xiaojing(College of Ewironmental Science and Engineering,Tongji University,Shanghai 200092,China;Key Laboratory of Yangtze River Water Environment,Ministry of Education,Tongji University,Shanghai 200092,China;School of Life Health Information Science and Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China;School of River and Ocean Engineering,Chongqing Jiaotong University,Chongqing 400074,China)

机构地区：[1]同济大学环境科学与工程学院,上海200092 [2]同济大学长江水环境教育部重点实验室,上海200092 [3]重庆邮电大学生命健康信息科学与工程学院,重庆400065 [4]重庆交通大学河海学院,重庆400074

出　　处：《净水技术》2024年第S01期37-48,共12页Water Purification Technology

基　　金：国家“十四五”重点研发计划项目(2021YFC3201304);福州市供水系统水质稳定特性及对策研究(kh0040020203000);江苏银羊不锈钢管业有限公司企业项目(20202847)。

摘　　要：试验以砖红壤中Cl^(-)和含水率为研究要素,借助电化学工作站,开展3种不锈钢供水管材(304、304L、316L)外腐蚀试验。结果表明:3种不锈钢在不同Clˉ和含水率的砖红壤中均有不同程度腐蚀倾向(304>304L>316L);当砖红壤Clˉ质量分数在10~1 250 mg/kg时,3种不锈钢腐蚀电流增幅(ΔI_(corr低))较大,为304L>316L>304,当Cl_(ˉ)质量分数在1 250~2 500 mg/kg时,其Δ_(Icorr高)较小,为304L>304>316L,即腐蚀减缓,Clˉ在一定范围内促进不锈钢管材腐蚀。与此同时,当砖红壤含水率在5%~35%时,3种不锈钢ΔI_(corr)为304L>316L>304,其中,当含水率在15%~25%时,其ΔI_(corr中)较大,为304L>316L>304,即腐蚀加快,含水率在一定范围内使不锈钢管材腐蚀加快。The chloride ion(Cl^(-))and moisture ofthe latosol were selected to investigatethe external corrosion behaviors of three types of stainless steel,304,304L,316L.The results revealed that 316L stainless steel exhibited strong resistance of environmental erosion,304L followed and 304 the worst in latosol no matter in the concentrations of Cl-and moisture.Particularly,when experimental latosol contained C-from 10 mg/kg to 1250 mg/kg,the increments of corrosion current(ΔI_(corr纸))of the three types of stainless steel appeared obviously,where 304L>316L>304.When the concentration of Cl varied from 1250 mg/kg to 2500 mg/kg,the relative lower increments of ΔI_(corr高) were obtained,where 304L>304>316L,indicating that the soil environment with low Cl^(-) promoted corrosion and high Cl^(-) suppressed corrosion.Additionally,when the moisture of latosol was changed from 5%to 35%,the Ar values of three type stainless steel ordered by 304L>316L>304.When the moisture of soil increases from 15%to 25%,I_(corr) varied more obviously,and 304L>316L>304,indicating that moisture was conducive to improve corrosion progresses of the buried stainless steel under a certain range.

关 键 词：供水管道 不锈钢 土壤外腐蚀 动电位极化曲线 电化学阻抗谱 

分 类 号：TU991[建筑科学—市政工程]